What the f!@?! is wrong with my bike!? (Honda GB)

[T.W.R]

the 38hp is at the crank, but the 33 was on the dyno of a stock 500cc.

I took her out for a spin yesterday and I SWEAR she was far more guttless than shes been since the dyno.

.........

[sammcj]

.........

Hmm... is it possible those tappets could have self adjusted?
After we adjusted them that time when I took it back to KG he said he had to space them out a bit as he couldn't move them at all?




She was really REALLY good after the Dyno, since then I've done perhaps 200KM?

What could have self-adjusted since then...?

[Kickaha]

I took her out for a spin yesterday and I SWEAR she was far more guttless than shes been since the dyno.

More likely you have just got used to it

[sammcj]

More likely you have just got used to it

I considered that, feels like shes running out of steam a bit... oh well...

Think I really need to save up and get a sports bike

[T.W.R]

Hmm... is it possible those tappets could have self adjusted?
After we adjusted them that time when I took it back to KG he said he had to space them out a bit as he couldn't move them at all?




She was really REALLY good after the Dyno, since then I've done perhaps 200KM?

What could have self-adjusted since then...?

After the bollocks he put you through are you really going to listen to his woffle?

you saw what was done, how it was done and what the specs for the clearances were and what they were set at with your own eyes.

Take the plug out & lets see what colour she's burning

[sammcj]

After the bollocks he put you through are you really going to listen to his woffle?

you saw what was done, how it was done and what the specs for the clearances were and what they were set at with your own eyes.

Take the plug out & lets see what colour she's burning

Yeah I know, still though... Seemed to go alright on the way to work this morning.

I'll check out the plug this weekend, mixture should be mint unless the bike fairy has been tinkering with my carbie over night

I've got to get a new front guard made up too - perhaps Santa will bring me one if I ask him nicely.

[T.W.R]

I'll check out the plug this weekend, mixture should be mint unless the bike fairy has been tinkering with my carbie over night

Got nothing to do with whats happening with the carb mixture unless you've been a Harry Ham-Fist whilst you've been riding it....

post a piccy of the plug when you've got it out

[sammcj]

unless you've been a Harry Ham-Fist whilst you've been riding it....

hah well I probably do ride it a bit 'harder' than it was indented to be ridden.

[T.W.R]

hah well I probably do ride it a bit 'harder' than it was indented to be ridden.

you been sniffing the exhaust fumes again ?

[sammcj]

you been sniffing the exhaust fumes again ?

Getting a much 'richer' hit after the the tune-up

[sammcj]

Take the plug out & lets see what colour she's burning

Plug: DPR8EIX-9

It's about 4 months old so it was in there when the bike was running lean.

Gap:
about 0.65mm

Colour:

Black around the very top where the tread ends.
VERY white on the Side Electrode
Center Electrode is clean

[sammcj]

Adjusted Gap to 0.85-0.90mm as per GB500 Manual.

I'm guessing it was so white because of how lean it was before the tune-up.

[T.W.R]

Colour looks pretty good but possibly a bit of insulator glazing.... so if that being the means there's been a sudden rise in plug temp during use which would concurr with the slight mis-fire you've mentioned before. If you've got a standard plug go to the next heat range 8 to a 9 (colder)

you don't screw around with the gap on an Iridium plug

[sammcj]

Yeah that pretty much co-insides with what I've read.

you don't screw around with the gap on an Iridium plug

[enth]

Haven't read through all the posts but I thought I'd put in my two cents seeing as though I really like your bike

Maybe there is slight dent/dip in one of the cylinders? If it's super small no one would notice it and bike could still run?

I could be totally wrong though.